Diamesa caucasica

Author: Kownacki and Kownacka, 1973

Diagnosis (n=1, material in coll. Kownacki)
Exuviae 6.2mm long. Brownish exuviae with broad brown anterior transverse band continuing down the lateral adhesion marks; the brown teeth joined by a golden yellow band; anterior and posterior adhesion marks of the tergites also golden; lateral margins of segments golden-brown.
Cephalothorax: Frontal setae 155µm long. Precorneal setae 2,3: 170; 145µm long. Thoracic horn 263µm long.
Abdomen: Hook row II absent. Total dorsal teeth I-VIII 110+; teeth brown, 50µm long, not set on distinct mounds. Total ventral teeth III-VIII 88+. Tergites II-IV behind posterior tooth rows with at most a few points. Shagreen points of tergite III 7.5µm long. Lateral margins of segments II-V strongly serrate. Relative length IX:VIII:VII = 1.0:0.67:0.83; relative width segments IX:VIII:VII = 1.0:1.3:1.6. Segments VII and VIII of the same shape: narrow rectangular, 2.7x as wide as long (032a.jpg). Lateral setae 1-4 of segment III 85; 85; -- 90; 125µm long.
Anal segment: Dorsal points of tergite IX spreading across anal lobes. Anal lobe ratio 1.4. Each anal lobe with 3 macrosetae; length macrosetae 0.7x lobe length. (032a.jpg)

Species keys out at Page 562: Diamesinae 38 Diamesa of the Text Key.

Caucasian mountains.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Cold stream.